Overshot nozzle



Patented Jan. 1Q, 195i) OVERSHOT. NOZZLE Ward E. Snowdon and Harvey-v F.r Raynor, Mo-

desto, Calif., assignors to Snowd'en: Chemical?. Company, Modesto, Califi, at partnersl'lin Application April 3, 1945, Serial No; 5861318 1 Claim.

This invention relates in general to iire iighting equipment, and in particular the invention is directed to an improved nozzle for the discharge of a fire extinguishingV substance.

One of tht objects of this invention is to provide a fire ghting nozzle especially useful in connection with dry chemical re extinguishing compounds in the form of powder which is fed in a high pressure stream of nitrogen or the like through the nozzle at high velocity.

Another object of the invention is to provide an overshot type re fighting nozzle of novel construction; such nozzle, when in operation, producing a very effective fire extinguishing fog or blanket over the blazing are-a as, for example, an oil. reservoir.

A further object of the invention is to provide a nozzle, of the type described, which includes means to discharge the high velocity re iighting materialI both endwise and laterally from the nozzle in great diffusion, whereby to cover an extended larea with the resultant fog.

Fig. 1 is an elevation of the nozzle-in use.

Figure 2 is an enlarged sectional elevation of the nozzle'.

Figure 3 is an enlarged front end view of the nozzle.

Figure 4 is a sectional elevation of a modification.

Figure 5 is a front end view ofthe nozzle shown in Fig. 4.

Referring now more particularly to the characters of reference on the drawings, and particularly at present to Figs. 1-3 inclusive, the nozzle is indicated generally at I, and is shown mounted for over-shot use in connection with the downturned: forward end portion 2 of a tubular handle 3". At its forward end the handle is in communication with` the nozzle I, while at its rear end said handle is adapted to be connected with a source @not shown) of high pressure. iire extinguishing substance, such as, for example, a dry chemical fire,v extinguisher in4 powder iorm carried in) a high pressure stream of nitrogen.

The structural details of the nozzle I are shown in Figs. 2. and 3 and comprise the following:

The nozzle I comprises an. annual relatively short main body 4 provided with a rearwardly extending tubular neck 5 which is coupled to the outer end of the handle portion 2 in any suitable manner.

The main body 4 includes an axial passage 6 whose internal diameter is at least as great as that of the adjacent end of the portion 2 of the handle I. The axial passage 6 in body 4 is straight for some distance ahead'y of the neck 5V and thence flares sharplyl forwardly and outwardlyy toform a` bell Beyond the bell 'I and inaxialalinement with the annular main bodyv 4, the nozzle includes an annular frusto-conical deector 8- whose rear face is forwardly and outwardly flared, as at 9, in spaced: but' matching relation to the bell 1; thel space between' the bell 1 andi face 9 providing an `z-nn-ula'r forwardly and outwardly ilaringport |01 Theannular frusto-conicat deflecter 8. is of substantially the same diameter as the annular main body 4, and isv connected to the latter4 with the proper spacing between bell- 1: and face' 9' by means of a plurality of circinnferentially' spaced connecting pinsA disposedparallel to theaxis of said: nozzles and adjacent but short of the peripheries-of the-bodyl 4 and.` deflector 8.

Thedeector 8f is formedy with: an axial passage |-2 extending therethrough, saidpassage. at-

itsf rear end, being ofreduced' diameter relative to the rear end portion off` the passage 6i with which said passage |12 communicates. Ahead of its rear end portion the axial passage I2 flares sharply forwardly and outwardly tok provide anotherbell- |33.V

An annular enddefleetor I4 of' frusto-conical coniiguration projects into the bell |3`;y the rear face l5 of the d'eeotor |54 beingr symmetrical to but spacedi from the bell I3k whereby to form' a forwardiy and outwardly flaring port I6 corresponding generally tobut disposed ahead of the` port L0.

The end;` deflector |41 is of lesser diameter than the deii'ector 8 and is supported in position bythe forward end portions of the circumferentially spaced pins I'fl2 thev manner clearly shown in Fig; 2'-` Thev enddeflector |41 includes thereinanl axial' passage I'I open at its rear end` in communicati'orr with the passage |`2 of deilectori 8; but of substantially reduced diameter. The passage |11 terminates in the end' deector |.4 short. of the f outer' end-l thereof?, andi' a central axial jet t8, to-

gether withj a plurality of circumferentially spaced, dii/erging' jets t9, communicate at their inner ends with the passageA I1?. open through the outer end or face of the end deiiector I4 in symmetrically spaced relation about said central jet I8.

Both the annular frusto-conical deflector 8 and the annular frusto-conical end deflector I4 are formed, at vcircumferentially spaced points, in the peripheries thereof, with diffusing notches The jets |591 20. The connecting pins l I extend from the body 4 through the intermediate deector 8 inwardly of its peripheral notches 20 and connect with the periphery of the end deflector I4 intermediate its peripheral notches 20; thus avoiding interference with each set of notches and assuring of eiective diifusing action thereby.

In use of the abovel describedV nozzle, it is disposed over the source of a lire, here indicated diagrammatically in Fig. 1 as an open topped tank 2l. The operator stands to one side and projects the tubular handle 3 toward the fire, with the down-turned forward end portion 2 directly over the re in the manner shown in Fig. 1.

Thereafter the high pressure ,fire extinguishing medium is introduced into the handle 3 and thence discharges laterally from the nozzle through the ports I0 and I 6, and endwise from the nozzle through the jets I8 and I9. The jet I8 discharges substantially straight downward, while the jets I9 discharge divergently. With the iire extinguishing medium discharging from the sev-- eral openings of the nozzle, as above, an effective fire Iblanketing fog is developed over an extended area, accomplishing extinguishment of the re in a minimum of time.

The notches 20 as formed in the peripheries of the deectors 8 and I4 serve to further the diinsing action of the nozzle. As the notched annular periphery of the end deflector I4 is of substantially lesser diameter than, and concentric to, the notched annular periphery of the intermediate defiector 8, fire fighting uid is diffused forwardly from said notched peripheries different distances from the longitudinal axis of the nozzle vwhich is advantageous.

In the embodiment of Figs. 4 and 5, the disclosed nozzle is similar to the form shown in Figs. 1-3 inclusive, but omits the intermediate deflector 8. This form of the nozzle comprises an annular body 22 having an axial passage 23 therethrough; said body being coupled to the tubular handle 24 by a threaded connection 25, with the handle in communication with the passage 23. y

The passage 23 flares forwardly and outwardly at its forward end portion to `form a bellA 26, and an end deector 2'I of frusto-conical configuration and of substantially the same arrangement as the end deector I4, but slightly shorter, projects into the bell as shown, whereby to form an annular forwardly and outwardly flaring port 28. The end deflector 2'I is supported, as in the previous embodiment, by circumferentially spaced pins 29. The end delector 21 similarly includes While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claim.

Having thus described the invention, the following is claimed as newand useful and upon which Letters Patent is desired:

A lire iighting nozzle comprising a body having an axial passage therethrough, the forward end portion of the passage aring forwardly and outwardly to form a bell, an intermediate frustoconical deflector projecting centrally into the bell in adjacent but spaced relation, the space between the bell and said intermediate deflector forming an annular forwardly and outwardly haring port, said intermediate deflector having an axial passage therethrough which flares for wardly and outwardly at its forward end portion to form another bell, a frusto-conical end dea central jet 30, diverging jets BI, and peripheral diifusing notches 32; said jets communicating at their inner ends with an axial passage 33 in the deflector 2l, which passage is of lesser internalY diameter than, but communicating with, the passage 23 in body 22.

VThe nozzle shown in Figs. 4 and 5 is used and functions in the same manner as the embodiment of Figs. 1-3, inclusive. I

From the foregoing description it will be readily seen that there has been produced such a device as substantially fullls the objects of the invention as set forth herein.

flector projecting centrally into said other bell in adjacent but spaced relation, the space between said other bell and the end deiiector form'- lng another annular forwardly and outwardly ilaring port, the end deilector having an axial passage therein from its inner end forwardly to a port short of its outer end, the apex of the intermediate deflector and the inner end of the axial passage therein being of reduced diameter relative to the axial passage in the body, the apex of the end def-lector and the inner end of the axial passage therein being of reduced diameter relative to the axial passage in said intermediate deilector, there being jet passage means through the outer end portion of said end deflector communicating with the axial passage in said end deflector, and means connecting the body and said deectors in rigid unitary relation.

WARD E. SNOWDEN.

HARVEY F. RAYNOR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 132,617 Allen Oct. 29, 1872 441,365 De Kinder Nov. 25, 1890 532,281 Melavin Jan. 8, 1895 592,447 Richardson Oct. 26, 1897 1,153,805 MacDonald Sept. 14, 1915 1,606,377 Murray Nov. 9, 1926 1,674,480 Nelson June 19, 1928 1,901,806 Fulton Mar. 14, 1933 1,996,545 Knowlton Apr. 2, 1935 2,127,188 Schellin et al Aug. 16, 1938 2,197,667 Shook Apr. 16, 1940 2,224,450 Scofield Dec. 10, 1940 2,255,688 Tavone Sept. 9, 1941 2,413,083 Snowden et al Dec. 24, 1946 FOREIGN PATENTS Number Country Date 330,187 Germany Nov. 9, 1918 

